Format

Send to

Choose Destination
Appl Opt. 2003 Jan 20;42(3):445-57.

Measuring and modeling twilight's purple light.

Author information

1
Mathematics and Science Division, U.S. Naval Academy, Annapolis, Maryland 21402, USA. raylee@usna.edu

Abstract

During many clear twilights, much of the solar sky is dominated by pastel purples. This purple light's red component has long been ascribed to transmission through and scattering by stratospheric dust and other aerosols. Clearly the vivid purples of post-volcanic twilights are related to increased stratospheric aerosol loading. Yet our time-series measurements of purple-light spectra, combined with radiative transfer modeling and satellite soundings, indicate that background stratospheric aerosols by themselves do not redden sunlight enough to cause the purple light's reds. Furthermore, scattering and extinction in both the troposphere and the stratosphere are needed to explain most purple lights.

PMID:
12570266
DOI:
10.1364/ao.42.000445

Supplemental Content

Full text links

Icon for Optical Society of America
Loading ...
Support Center